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A method for non-destructive sampling and measurement of carbon cake layer in particle trap

A particle trap and non-destructive sampling technology, which is applied in the direction of measuring devices, internal combustion engine testing, machine/structural component testing, etc., can solve the problems of inaccurate sampling, carbon cake layer falling off, fragmentation, pollution, etc., to improve pollution situation, improving usage efficiency, and reducing usage

Active Publication Date: 2018-10-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of sawing the DPF, the severe vibration will cause the carbon cake layer attached to the DPF carrier wall to fall off and break up. This process will destroy the microstructure of the carbon cake layer, while the carbon cake layer on the cutting surface Falling off will lead to the destruction of the distribution state of the soot inside the DPF. At this time, it will not be possible to accurately measure the distribution and deposition position of the soot inside the DPF; and the broken carbon cake layer will follow the cutting tool (hacksaw or wire saw) ) movement is dispersed in various areas of the DPF, and the cutting surface of the DPF is also the sampling surface, which will be covered and polluted by the debris of the carbon cake layer in different areas, resulting in inaccurate sampling
There is a lack of more accurate measurement data for the distribution of soot in the DPF and the analysis of the physical and chemical properties of the carbon cake layer in different parts of the DPF

Method used

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  • A method for non-destructive sampling and measurement of carbon cake layer in particle trap
  • A method for non-destructive sampling and measurement of carbon cake layer in particle trap
  • A method for non-destructive sampling and measurement of carbon cake layer in particle trap

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Effect test

Embodiment 1

[0031] Embodiment 1: A method for non-destructive sampling and measurement of carbon cake layer in engine particulate filter: Cut the particle trap into blocks of different sizes according to the density and step size of sampling in different axial and radial regions of the particle trap;

[0032] Number each sub-block, and reassemble the sub-blocks according to the numbering order to form a complete particle trap;

[0033] The assembled particle filter is wrapped with flexible high-temperature resistant material, then wrapped with copper skin, and then fastened with a stainless steel frame;

[0034] Pack the fastened particulate filter into the engine exhaust pipe, and carry out the soot loading test according to different engine speeds and loads;

[0035] After the loading test is completed, take out the particle trap from the engine exhaust pipe, disassemble and remove each numbered block in turn, and then sample and measure the soot on each block.

[0036] Such ...

Embodiment 2

[0040]Embodiment 2: The particle trap block 4 can be cut into equal parts by axially segmenting and radially dividing the particle trap, or calculating the soot distribution result in the particle trap according to CFD simulation , non-equal cut block.

[0041] The thickness of the copper skin layer 6 needs to be appropriate, and it should be selected according to the geometric size of the particle trap. It needs to be able to tightly wrap the split particle trap wrapped with the high-temperature-resistant asbestos layer 5. If the copper skin layer 6 is too thick, it cannot be tightly packed. On the other hand, if the package is too thin, it will lack sufficient strength to provide sufficient support for the particle filter after splitting.

[0042] Before the test, the blocks 4 were put together and tightly wrapped with a high-temperature-resistant asbestos layer 5 and a copper skin layer 6 for reinforcement. The through holes on the two ring-shaped frames 1 are used to comp...

Embodiment 3

[0045] Embodiment 3: Under the condition of ensuring the processing size of the limit boss on the circular frame 1 and the through hole of the screw rod 2, the size of the air flow hole should be increased as much as possible, so as to ensure that the exhaust gas entering the particle trap will not be excessive. Much hindrance.

[0046] The number of screw rods 2 between the two circular frames 1 depends on the size of the particle trap, and can be set as a connection with 4 holes or 6 holes.

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Abstract

The invention, which belongs to the technical field of the internal combustion engine testing, relates to a non-destructive sampling and measuring method for a carbon cake layer in a diesel particle filter. The method comprises: an integrated diesel particle filter is cut along an axial direction or a radial direction; numbering and splicing are carried out; after coating by a asbestos layer and a copper sheet layer, the front part and the tail part of the coated diesel particle filter are embedded into a circular-ring-shaped metal frame and then are fastened by connecting screw rods and gland nuts; and then the fastened diesel particle filter is packaged into an engine exhaust pipe to carry out soot loading testing. According to the invention, under the circumstance that the soot distribution of the diesel particle filter is not damaged, soot distribution in the diesel particle filter can be measured and carbon cake layer samples captured on all diesel particle filter blocks can be obtained without destruction. With the non-destructive sampling method, the accurate basis data can be provided for the soot distribution study of the diesel particle filter.

Description

technical field [0001] The invention relates to a method for non-destructive sampling and measurement of a carbon cake layer in an engine particle trap, and belongs to the technical field of internal combustion engine testing. Background technique [0002] Diesel Particle Filter (DPF for short) can filter more than 90% of particulate matter (Particle Mater, PM) in automobile exhaust. However, the distribution state of soot in the particulate filter, as well as the thickness and structure of the carbon cake layer formed by soot accumulation have a major impact on the design of the catalyst coated on the DPF and the coating position of the catalyst , which in turn will affect the soot capture and regeneration efficiency of the DPF. Therefore, it is necessary to focus on the movement and distribution characteristics of soot in the DPF, which requires non-destructive sampling of the carbon cake layer in the DPF, so that it can be analyzed by scanning electron microscopy, thermo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/10G01N5/02
CPCG01M15/102G01N5/02
Inventor 张韦孔梦茜陈朝辉陈贵升
Owner KUNMING UNIV OF SCI & TECH
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